The student council is going on a field trip. There are 5 officers, 2 sixth-grade representatives, 8 seventh-grade representatives, and 12 eighth-grade representatives. Two faculty advisors, 3 parent volunteers, and 1 principal are joining the students on the trip. What is the number of students per adult going on the field trip?
a. 2 students per adult
b.22 students per adult
c.4 students per adult
d.1 student per adult
